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Reconciliation of Net Income per Chinese GAAP to Net Income per US GAAP (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Noncontrolling Interest [Line Items]        
Net income $ 1,224,122 $ 3,695,001 $ 3,246,687 $ 8,257,968
Erdos TCH
        
Noncontrolling Interest [Line Items]        
Net income, China Gaap     679,186 2,038,444
Net income     1,244,689 3,416,491
Erdos TCH | Adjustments under US GAAP | Revenues
        
Noncontrolling Interest [Line Items]        
Net income loss adjustments     (7,134,477) 5,125,394
Erdos TCH | Adjustments under US GAAP | Cost Of Revenue
        
Noncontrolling Interest [Line Items]        
Net income loss adjustments     4,190,397 (5,072,460)
Erdos TCH | Adjustments under US GAAP | Operating Income
        
Noncontrolling Interest [Line Items]        
Net income loss adjustments     (2,264,894) 2,091,378
Erdos TCH | Adjustments under US GAAP | Interest Income
        
Noncontrolling Interest [Line Items]        
Net income loss adjustments     3,703,026 1,785,208
Erdos TCH | Adjustments under US GAAP | Income Before Income Tax
        
Noncontrolling Interest [Line Items]        
Net income loss adjustments     1,438,132 3,876,586
Erdos TCH | Adjustments under US GAAP | Deferred Income Taxes
        
Noncontrolling Interest [Line Items]        
Net income loss adjustments     $ (193,443) $ (460,095)